The analysis of biological data found that white blood cell count (WBC) inferior to 10 G/L, polymorph nuclear (PMN) count inferior to 7.7 G/L, CRP > 185 mg/L, and serum glutamo pyruvate transaminase (TGP) and/or serum glutamo oxaloacetic transaminase (TGO) greater than 1.5 times the normal range were significantly associated with Q fever CAP in bivariate analysis (Tables 1 and 4). The gene discussed is CRP; the disease is Q fever.